Hardness including 80A/85A/90A/95A). Normally including two categories: Polyester and polyether. Shore shore 60A-72D. FDA certification; Non-toxic, anti-wear ability (more wear than the POM and nylon), soft, high, silence, similar than the hardness of the rubber has a higher modulus of elasticity; Good resistance to oil, hydrolysis, anti-UV (ozone) of the performance, in a solvent and fuel in a ...